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Study of the Synthesis of Mullite From Kaolin-α-Al2O3 and Kaolin-Al(NO3)3

Published online by Cambridge University Press:  20 December 2012

E. M. Lozada ,
O. Alanís ,
F. Legorreta  and
L. E. Hernández
E. M. Lozada*
Affiliation:
Centro de Investigaciones en Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, Carr. Pachuca-Tulancingo km 4.5, C.P. 42184, Mineral de la Reforma, Hidalgo, México.
O. Alanís
Affiliation:
Centro de Investigaciones en Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, Carr. Pachuca-Tulancingo km 4.5, C.P. 42184, Mineral de la Reforma, Hidalgo, México.
F. Legorreta
Affiliation:
Centro de Investigaciones en Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, Carr. Pachuca-Tulancingo km 4.5, C.P. 42184, Mineral de la Reforma, Hidalgo, México.
L. E. Hernández
Affiliation:
Centro de Investigaciones en Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, Carr. Pachuca-Tulancingo km 4.5, C.P. 42184, Mineral de la Reforma, Hidalgo, México.
*
*E-mail: [email protected]
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Abstract

The synthesis of mullite from kaolin clay and two precursors of aluminum: α-Al2O3 and Al(NO3)3 was investigated. In order to study the temperature effect, the system kaolin-α-Al2O3 was calcined in air in a range of 1200 to 1500°C, for 2 h. For the system kaolin-Al(NO3)3, the combustion method was employed, using urea as fuel, and calcined in air at 1500°C for 2 h. The products were characterized by X-ray diffraction, scanning electronic microscopy (SEM), energy dispersive spectroscopy and particle size analysis in order to analyze and compare their morphology and structure. The crystallographic study revealed an incomplete reaction between the kaolin and the α-Al2O3. Nevertheless, in the system kaolin-Al(NO3)3, it was obtained mullite with high purity and trace amounts of cristobalite.

Keywords

x-ray diffraction (XRD)structuralscanning electron microscopy (SEM)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1481: Symposium 2D – Structural and Chemical Characterization of Metals, Alloys and Compounds—2012 , 2012 , pp. 11 - 17
Copyright
Copyright © Materials Research Society 2012

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References

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